Kolkata, Feb 26: Security measures have been tightened in and around the city in view of President A P J Abdul Kalam's two-day visit beginning today. Official sources said here that Dr Kalam would arrive in the city tonight and drive straight to the Rajbhavan. The president will attend as many as eight programmes tomorrow before returning to Delhi in the evening. Dr Kalam will visit a Muslim orphanage, the Agri-horticulture society garden, Arabinda Bhavan and attend the centenary celebrations of the Mitra institutions. Bureau Report